Nonhost plant species as donors for resistance to pathogens with narrow host range I. Determination of nonhost status

Niks, Rients E.

doi:10.1007/bf00051868

Cited by 46 publications

(49 citation statements)

References 32 publications

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“…Full nonhost resistance can be defined as immunity, displayed by an entire plant species against all genotypes of a plant pathogen (Heath 2000). Drawing a discrete line between host and nonhost status is not always straightforward since some plant species-pathogen species combinations suggest marginal host or near-nonhost status, when only few accessions of a plant species are at most moderately susceptible to a heterologous pathogen (Niks 1987). It has been shown, for example, that barley is a full host to P. hordei, a near nonhost to some heterologous rust species, and a full nonhost to some other rust species, like P. recondita f. sp.…”

Section: Discussionmentioning

confidence: 99%

High Diversity of Genes for Nonhost Resistance of Barley to Heterologous Rust Fungi

Jafary¹,

Albertazzi²,

Marcel

et al. 2008

Genetics

102

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Inheritance studies on the nonhost resistance of plants would normally require interspecific crosses that suffer from sterility and abnormal segregation. Therefore, we developed the barley-Puccinia rust model system to study, using forward genetics, the specificity, number, and diversity of genes involved in nonhost resistance. We developed two mapping populations by crossing the line SusPtrit, with exceptional susceptibility to heterologous rust species, with the immune barley cultivars Vada and Cebada Capa. These two mapping populations along with the Oregon Wolfe Barley population, which showed unexpected segregation for resistance to heterologous rusts, were phenotyped with four heterologous rust fungal species. Positions of QTL conferring nonhost resistance in the three mapping populations were compared using an integrated consensus map. The results confirmed that nonhost resistance in barley to heterologous rust species is controlled by QTL with different and overlapping specificities and by an occasional contribution of an R-gene for hypersensitivity. In each population, different sets of loci were implicated in resistance. Few genes were common between the populations, suggesting a high diversity of genes conferring nonhost resistance to heterologous pathogens. These loci were significantly associated with QTL for partial resistance to the pathogen Puccinia hordei and with defense-related genes.

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Section: Discussionmentioning

confidence: 99%

High Diversity of Genes for Nonhost Resistance of Barley to Heterologous Rust Fungi

Jafary¹,

Albertazzi²,

Marcel

et al. 2008

Genetics

102

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“…Ideally, cross-inoculation tests should include a substantial number of different plant genotypes (and not just one) in order to decide whether a plant species is a host or a nonhost (51). The number of plant genotypes/species used in our tests was limited by the accessibility of P. caerulea and S. alboroseum materials and also by practical considerations.…”

Section: Discussionmentioning

confidence: 99%

Oidium neolycopersici: Intraspecific Variability Inferred from Amplified Fragment Length Polymorphism Analysis and Relationship with Closely Related Powdery Mildew Fungi Infecting Various Plant Species

Jankovics¹,

Bai²,

Kovács³

et al. 2008

Phytopathology®

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Jankovics, T., Bai, Y., Kovács, G. M., Bardin, M., Nicot, P. C., Toyoda, H., Matsuda, Y., Niks, R. E., and Kiss, L. 2008. Oidium neolycopersici: Intraspecific variability inferred from amplified fragment length polymorphism analysis and relationship with closely related powdery mildew fungi infecting various plant species. Phytopathology 98:529-540.Previous works indicated a considerable variation in the pathogenicity, virulence, and host range of Oidium neolycopersici isolates causing tomato powdery mildew epidemics in many parts of the world. In this study, rDNA internal transcribed spacer (ITS) sequences, and amplified fragment length polymorphism (AFLP) patterns were analyzed in 17 O. neolycopersici samples collected in Europe, North America, and Japan, including those which overcame some of the tomato major resistance genes. The ITS sequences were identical in all 10 samples tested and were also identical to ITS sequences of eight previously studied O. neolycopersici specimens. The AFLP analysis revealed a high genetic diversity in O. neolycopersici and indicated that all 17 samples represented different genotypes. This might suggest the existence of either a yet unrevealed sexual reproduction or other genetic mechanisms that maintain a high genetic variability in O. neolycopersici. No clear correlation was found between the virulence and the AFLP patterns of the O. neolycopersici isolates studied. The relationship between O. neolycopersici and powdery mildew anamorphs infecting Aquilegia vulgaris, Chelidonium majus, Passiflora caerulea, and Sedum alboroseum was also investigated. These anamorphs are morphologically indistinguishable from and phylogenetically closely related to O. neolycopersici. The crossinoculation tests and the analyses of ITS sequences and AFLP patterns jointly indicated that the powdery mildew anamorphs collected from the above mentioned plant species all represent distinct, but closely related species according to the phylogenetic species recognition. All these species were pathogenic only to their original host plant species, except O. neolycopersici which infected S. alboroseum, tobacco, petunia, and Arabidopsis thaliana, in addition to tomato, in cross-inoculation tests. This is the first genome-wide study that investigates the relationships among powdery mildews that are closely related based on ITS sequences and morphology. The results indicate that morphologically indistinguishable powdery mildews that differed in only one to five single nucleotide positions in their ITS region are to be considered as different taxa with distinct host ranges.

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“…A plant species of which all germplasm is resistant to all genetic variants of a pathogen is known as a nonhost (Niks 1987;Heath 2000). In a host species that coevolved with its pathogen, certain accessions may display resistance to specific pathogenic strains.…”

Section: Nonhost (Versus Host) Resistancementioning

confidence: 99%

“…Like many biological phenomena, the division between host and nonhost status is not black and white, due to the quantitative nature of phenotypes in the transition between these two states (Niks 1987(Niks , 1988Bettgenhaeuser et al 2014). The evolutionary trajectory in which pathogen species try to establish a compatible interaction with a plant species is an ongoing process with transitions from compatibility to incompatibility and vice versa.…”

Section: Nonhost (Versus Host) Resistancementioning

confidence: 99%

“…The evolutionary trajectory in which pathogen species try to establish a compatible interaction with a plant species is an ongoing process with transitions from compatibility to incompatibility and vice versa. Therefore, some distinguish subdivisions between host and nonhost status, like intermediate host and intermediate nonhost (Niks 1987;Bettgenhaeuser et al 2014;Dawson et al 2015).…”

Section: Nonhost (Versus Host) Resistancementioning

confidence: 99%

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Nonhost wild lettuce as a donor for resistance to downy mildew in cultivated lettuce

Giesbers¹

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Nonhost plant species as donors for resistance to pathogens with narrow host range I. Determination of nonhost status

Cited by 46 publications

References 32 publications

High Diversity of Genes for Nonhost Resistance of Barley to Heterologous Rust Fungi

High Diversity of Genes for Nonhost Resistance of Barley to Heterologous Rust Fungi

Oidium neolycopersici: Intraspecific Variability Inferred from Amplified Fragment Length Polymorphism Analysis and Relationship with Closely Related Powdery Mildew Fungi Infecting Various Plant Species

Nonhost wild lettuce as a donor for resistance to downy mildew in cultivated lettuce

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